If you have one of the modern DSLRs or Mirrorless bodies, they have a very efficient IR blocking filter infront of the sensor.
They are so good, you'll end up with very long exposure times and the image will be far red as opposed to true IR.
If you really want to get into IR, there are many 'astro' modded cameras out there at very modest prices.
Having something with LV means you can compose and focus normally.
Lens wise, try here...
https://luminescentphoto.com/blog/nikon-z-infrared-lens-performance-chart/#z-mount
Great discussion! I have the F mount AF-S 20mm f1.8 G ED lens that I may use on my Z9 with the FTZ ii adapter. Any comments about issues I might run into? I also have the F mount 16-35mm lens too.
I personally think Nikon should update the Z7 II to a ver. III, as the current model has an outdated pair of EXPEED 6 processors and the AF performance, EVF etc. could perform better with EXPEED 7. Why not use the Z8 or Z9? I was shooting a theatrical play on Friday and the Z8 gave quite horrible horizontal lines in some of the lighting configurations that they used for the play. I fortunately had the Zf with me so I could shoot with mechanical shutter and it worked flawlessly. There was enough light to benefit from the higher resolution of the 45 MP sensor if I had had one with mechanical shutter. Would the Z7 II have worked? Yes, but it doesn't have the AF performance of the newer cameras nor a lot of the user configurable features such as custom wide-area AF which is my favorite feature. I imaging using Nikon's new cloud system and other communication features would be available on a new Z7 III. I also find the EVF delay of the Z6 II was enough to annoy me and throw my timing off while the Z8 is fast enough to allow single shot timing manually based on what is shown in the EVF. The Zf seems to be somewhere in between but I've really liked that camera. It was the first time I got into trouble with the electronic shutter on the Z8 after using the camera for 1.5 years. I have shot a lot of figure skating and never run into banding in those events, they have higher-quality lighting.
Nikon could, of course, update the Z7 II when they have a new higher-resolution sensor ready, e.g., 60-100 MP.